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Title: Evidence for a Common Physical Origin of the Landau and BEC Theories of Superfluidity

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [3];  [4];  [5];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
  3. Univ. of Electro-Communications, Chofu, Tokyo (Japan). Dept. of Engineering Science
  4. Centre National de la Recherche Scientifique (CNRS), Grenoble (France). Inst. Neel
  5. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

There are two renowned theories of superfluidity in liquid 4He, quite different and each with specific domains of application. In the first, the Landau theory, superflow follows from the existence of a well-defined collective mode supported by dense liquid 4He, the phonon-roton mode. In the second, superflow is a manifestation of Bose-Einstein condensation (BEC) and phase coherence in the liquid. We present combined measurements of superfluidity, BEC and phonon-roton (P-R) modes in liquid 4He confined in the porous medium MCM-41. The results integrate the two theories by showing that well-defined P-R modes exist where there is BEC. The two are common properties of a Bose condensed liquid and either can be used as a basis of a theory of superfluidity. In addition, the confinement and disorder suppresses the critical temperature for superfluidity, Tc, below that for BEC creating a localized BEC phase consisting of islands of BEC and P-R modes. This phase is much like the pseudogap phase in the cuprate superconductors.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; FG02-03ER46038
OSTI ID:
1286799
Alternate ID(s):
OSTI ID: 1181009
Journal Information:
Physical Review Letters, Vol. 113, Issue 21; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (4)

Excitations in the quantum liquid 4 He: A review journal November 2017
Josephson relation for disordered superfluids journal February 2015
Quantum Monte Carlo study of the superfluid density in quasi-one-dimensional systems of hard-core bosons: Effect of the suppression of phase slippage journal December 2019
Phonons, rotons, and localized Bose-Einstein condensation in liquid He 4 confined in nanoporous FSM-16 journal April 2019

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